Ammonium paratungstate (APT) is one of the raw materials for preparing lanthanum tungsten electrode, the other two are three tungsten oxide and lanthanum acetate, which is a white crystalline compound, and there are two shapes, flaky and acicular.

Physical properties
Molecular weight: 283.9145
Molar mass: 3132.2g / mоl
Boiling point: 600 ℃
Shape: acicular white crystals, flaky white crystals white crystals
Solubility: slightly soluble in water, insoluble in alcohol. When the temperature is less than 20 ℃, its solubility (in water) is less than 2%; when the temperature rises to 220-280 ℃, ammonium paratungstate lose some crystal water and ammonia, converting to ammonium paratungstate (AMT); when the temperature rise up to 600 ℃, it will lose all ammonia and crystalline water, converts to WO₃ (yellow).

Application
It is mainly used for the preparation of WO₃ or metal W powder, and it can also be used to prepare AMT or the other tungsten compounds, electric vacuum material (tungsten wire, tungsten rod), tungsten carbide (tungsten carbide cutting tools, drills, dies, etc.), mechanical parts (wear resistance, high temperature resistance and compression resistance) or as an additive (in petrochemical industry).



 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Blind Killers tungsten dart rule is a really fun game designed to be played with 3 or more people. The more people playing the more fun it is. It is a great game to play when there are an odd number of people and everyone wants to play tungsten darts. This is also an excellent way to practice your out's for x01. This particular game is a game of memory, trust, luck, it is not a game to be played with strangers at the pub late at night (or for money).

The Object: To win Blind Killers you must simply be the last person on the scoreboard with a life left.

The Scoring: The names are place down the left side of the score board in any order. Generally, after the first game is played, the player who was knocked out first gets to throw first in the next game. For the first game, I usually do a closest to the bulls-eye with one tungsten dart each. Next to each name, three tally marks are placed to indicate the number of lives each player has left.

The Play: Play is identical to that of regular Killers except that no one knows what the other player’s numbers are! Please be sure to read the rules for Killers before continuing with this game.

The numbers 1 through 20 are written on slips of paper and placed in a hat. Each player takes a slip of paper and remembers the number on it. That number is that players number for the duration of the game. It is not necessary to throw your own double to become a killer (you'd only give away your number if you did.

This game obviously relies on honesty and memory. The player's must remember there number and watch carefully for other people to hit it. They must also remember how many lives they have left and step down when the third life is taken.

Variations of this game can be played to adjust to the players' level. You could use all triples for stronger players or require a double bull to become a killer. For weaker players, use the thin inner wedge of the number. On occasion, I have had several average players and one "I never picked up a tungsten dart before" kind of person (notice they always seem to win!?!) want to play. So what I do is set that the "new player" only has to hit the thin or thick single wedge to become a killer or kill while the rest of us have to hit doubles. With all the combinations available it's easy to balance the play to be fun for everyone.

Strategy: There is no strategy, this is a game of luck. The only hint is to try to watch your opponent faces and body language when you hit or get real close to a double, there might be the slightest reaction that can clue you if that number is owned.

  Tungsten Dart Manufacturer & Supplier: Chinatungsten Online - http://www.chinadart.com/
  Tel.: 86 592 5129696; Fax: 86 592 5129797
  Email:  sales@chinatungsten.com
  Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
  Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
  Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Tungsten trioxide is one of the materials for lanthanum tungsten electrode preparation, when using it for preparing electrodes, then you should pay attention to the following precautions:

(1) The presence of dust should be avoided.
(2) The process should be operated in a closed shop, and the local exhaust ventilation should be carried out to prevent dispersion of dust into the air in workshop.
(3) All relevant operating personnel must be trained specialized knowledge of tungsten trioxide, and ask them to strictly abide by the rules.
(4) All operators should wear rubber acid resistance suit, wearing self-absorption filter respirators, chemical safety goggles and rubber gloves and other protective equipment.
(5) The contact between tungsten trioxide and bromine pentfluoride or chlorine trifluoride should be avoided.
(6) Equipped with spill response equipment.
(7) Empty containers where may remain hazardous materials.
(8) Tungsten trioxide should be stored in cool and ventilated coffers and away from fire, heat and direct sunlight.
(9) Seal package, its storage should not mix with chlorine trifluoride or bromine pentfluoride.
(10) The storage area should have the right bucket to install spillage.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: sales@chinatungsten.com
 Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
 Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
 Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

Variations of stances have been adopted over the years (see below). However the one we will be concentrate on is the throwing arms foot forward. This is to say if you are right handed and you intend to throw with you right hand, then you place your right foot forward to the oche line.

Early throwers would adopt a stance as shown in diagram No.1. Booth feet forward touching the oche line. It seemed to be frowned upon to lean forward or move along the oche line as we see regularly today. You may still see one or two social players using this form of stance but it doesn't help keep the upper body stable therefore very few people use it.

Best foot forward this is sometimes referred too. The lead foot here the right, would indicate a right handed thrower. This is a much better stance and gives more stability to the upper body.

The last diagram shows the lead foot adjacent to the oche line. This requires you to view the board side on twisting your body slightly. Some players find this a little uncomfortable however it reduces the unwanted movement in the upper body. Top players will mainly use stances based upon diagram No2 & 3.

You should line your foot up so that you are central to the dartboard. Movement to either side can be adopted but for beginners this is best practice and most professional keep to this technique. The left foot is situated behind the right. Lean forward slightly placing the bulk of your weight on your lead right foot and adjust you stance slightly (if needed) so that you are comfortable with the position. Your stance should be strong and stable. You should feel comfortable in this position, but at first this will appear alien to you if you have never played before.

The stance will be slightly adjusted during the course of the game i.e. when lining up to hit a double either side of the board or lower board trebles. As the stance acts a bit like a rudder of a boat with the front foot as the pivot and the back moving to the left or to the right naturally changes the angle you face the board. Also bringing your back foot closer to the front foot or further away adjusts your height. Do this with a pair of dividers to see this clearly. Minor adjustments in the stance positions will line the dart throw up correctly. It helps to be conscious of these movements as this will help you later when you need to give self feedback.
 

  Tungsten Dart Manufacturer & Supplier: Chinatungsten Online - http://www.chinadart.com/
  Tel.: 86 592 5129696; Fax: 86 592 5129797
  Email:  sales@chinatungsten.com
  Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
  Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
  Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn